Manufacture of tire cords



.March 16, 1937. J, W, YAXLEY MANU'FACTURE oF TIRE ooRDs 'Filed oct. e, 195s JFlalmuq Summe MmHD/IW luv/d1 Flai Patented Mar. 16, 1937l i vUNITED STATE A 2,073,821 MANUFIA-CTURE F TIRE COBDS John William Yaxley, Montreal, Quebec, Canada, assigner to Drummondville Cotton Company, Limited, Montreal, Quebec, Canada Application October 6, 1933, Serial N0. 692,390

3 iClailIlS. (Cl. 117-52) su PATENT OFFICE The invention relates to the manufacture of tire cords, as described in the present specilication and illustrated in the accompanying drawing that forms part of the same.

5 The invention consists essentially in producing from fibers of different species, the finished product, as pointed out in the claims for novelty following a description in detail of a method of including the fireproof liber in the yarn and subsequent cord.

The objects of the invention are to construct a tire cord that will eliminate to the greatest' extent possible the dangers incident to the working of the cords in what are familiarly and commonly termed cord tires otherwise to furnish to the public a heat resisting element in the tire that will ameliorate the bad effects of friction and generally to provide for vehicle tires, eiiicient and durable cords.

In the drawing, Figure 1 is a diagram or table of the customary steps to produce a cord.

Figure 2 is a fragmentary sectional perspective view of a tire showing a cord withdrawn.

Figure ,3 is an exaggerated detail of a piece of cord partially undone to disclose the strands and threads and showing the asbestos fibres intermingling with the cotton.

`Like numerals of reference indicate corresponding parts in the various gures.

Referring lto the drawing, the nished cords indicated by the numeral l5 have the same appearance as tire cords presently manufactured from cotton and-other material, but in the beginning of the process, the lap in the scutching step is a thorough. mixture of raw cotton fiber and raw asbestos ber, and following the scutching, this lap or mixture of cotton and asbestos is carded preferably by a carding machine that is more suitable to the manufacture of wool 4o yarns.

After the carding the drawers operate, then the s1ubberintermediate and roving frames are used in the reduction of the thickness of the sliver, the evenness of the product, the twisting of the roving and the winding of the roving on the bobbin, and following this, the spinning machinery completes the attenuation of the roving so far as to form a thread or yarn and twist the yarn that is thus formed, and give it the required strength.

The name ply yarn is given to all threads K that are composed of two, three or more single yarns, twisted togetherxat one operation and these yarns al1 contain the asbestos ber introduced in the cotton liber, and when thus indcriminately mixed together, they are distinguished from one another by the terms two ply, three ply and so on, and when two or more ply threads are twisted together, the resulting 'yarns are spoken of as cabled yarns and the required strength having been reached, the plies of cotton and-asbestos constitute the cords.

Usually these cords are woven into margins at the ends and in between these margins occasional weft threadsare introduced there across. This is of course common practice, except for the asbestos, and the quantity of this asbestos in proportion to the quantity of the cotton is all a matter of judgment in so far as the manufacture is concerned, but usually anything from thirty to fifty percent is considered sufficient to resist overheating in the cords.

This must not be confused with asbestos cloth, which is not' introduced in the same way, neither is the cotton inrany quantity whatsoever, it is merely a binder in the asbestos web, usually there being approximately of asbestos and 10% of cotton or even less of the cotton and made by an entirely different process: It must be remembered that the present invention is a composite cord made up of several strands which in themselves are composite being composed of mixed asbestos bers and cotton filaments drawn out from the fibrous materials, which means that considerable tensile strength is maintained and this makes the cords desirable forreinforcement in building up tires and not to be compared or confused with Woven fabrics. The cord itself is the invention and not the manner of installation because-the task of introducing into a tire structure may be varied and in any event is largely conventional.

These cords have been indicated by the numeral I5 in the drawing while the numeral I6 indicates the strands of the cord. The threads forming the strands are indicated by the numeral l'l. The asbestos fibers I8 are shown as intermingling in the body of the cotton, although in the cord itself the asbestos bers are indistinguishable from the cotton so far as general appearance is concerned, the asbestos presenting here and there parts of the fibers on the surface of the cord which resist the heat and insulate the cord from the heat produced by friction which would otherwise tend to destroy the cord.

What I claim is:-

1. A composite tire cord made up from the i Vyarns resulting from the carding of a lap composed of a thorough mixture of cotton and asbestos bers.-

posed of a thorough mixture of cotton and asbestos fibers said asbestos bers presenting heat resistant elements to the surface of the cord when the yarns are twisted.

JOHN WILLIAM YAXLEY.' 

